Simple Elm base image

Simple

See: https://elm-lang.org.org

How to use this image

run repl directly:

$ docker build -t myelm .
$ docker run -it --rm myelm elm-repl

run reactor directly on default port:

$ docker build -t myelm .
$ docker run -it --rm myelm elm-reactor

run reactor directly on another port:

$ docker build -t myelm --build-arg ELM_PORT=9000 .
$ docker run -it --rm myelm elm-reactor -p 9000